Headlight and lead–acid battery: what they have in common

1. Step 1. Headlight — uses — Reflection of light. A reflector gathers the light into a beam.
2. Step 2. Reflection of light — is used in — Periscope. Reflection.
3. Step 3. Periscope — is part of — Submarine. A periscope.
4. Step 4. Submarine — has part — Lead–acid battery. Underwater, electric motors run on batteries.

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